Improvement in piston-packings



P. ESTES.

improvement in Piston-Packings. 4,427. Patented May 2,1871.

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Letters Patent No. 114,427, dated May 2, 1871.

IM PROVEM ENT IN PIS'TON-PACKINGS.

The Schedule referred to in these LetteraPatent and making part 'of thelune.

To all whom it mwy concern Be it known that I, PHILIP Esrns, ofLeavenworth,

in the county of Leavenworth .and State of Kansas,

have invented a new and useful Improvement in Piston-Packing; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawing making apart of this specification, in which- Figure 1 is a transverse section;

Figure 2 is a side elevation and Figure 3 is a sectional plan.

This invention relates to piston-heads provided with expansiblepacking-rings; and

It consists in the means employed for forcing said packing-ring outwardwhenever it may be necessary, in order to the preservation ofasteam-tight joint between the piston and cylinder.

Referring to the drawinga are ordinary-parted expansible packing-ringsinclosing a piston-head.

b is a parted ring, wedge-shaped in cipss-section, placed next withinthe rings a, having its straight side in contact with them.

'0 is a second parted ring, also wedge-shaped in cross-section, of lesswidth than the first and placed within it, with its inclined side nextto the inclined side of the other, the ring 0 being inverted withrespect to the ring I), and an empty space being left between its loweredge and the flange e, which backs the ring 11.

f is the annular base ofthe piston-head, and

h the radial braces which connect the annular base with the central hub'i.

k are screws entered in the upper side of the ring 0 and projecting alittle outside of the ring a.

l is the follower, the same being attached by screws to the radial braceh; v

When it becomes necessary to tighten the joint between the piston-headand the cylinder this is done by turning the follower-screws stillfurther into the braces h, by which operation the follower l is pressedagainst the projecting pins k, the ring 0 consequently;

rings 1) 0, pins It, and packing-rings (1, arranged as shown anddescribed, whereby, when the follower-screws are tightened, the pins 70are caused to force the ridge-inward, for the purpose specified. Totheabovespecification of my invention I have signed my name this 19thday of December A. D.

PHILIP ESTES.

Witnesses Sonon G. Knnon, A. W. HART.

